Just a friendly reminder about using arrays in boolean conditions

[user1234]

On Monday, 18 November 2024 at 12:20:17 UTC, user1234 wrote:
> On Sunday, 17 November 2024 at 08:57:35 UTC, Jonathan M Davis 
> wrote:
>> [...]
>
> Well I agree, even if that will take years to have .length 
> tested instead of .ptr.
>
> Little story however: I've encountered a case where the explict 
> check was also wrong.
>
> ```d
> module runnable;
>
> import std.stdio;
>
> void v(string s)
> {
>     if (s.length)           writeln("case length :`", s, "`");
>     else if (s is null)     writeln("case null :`", s,  "`");
>     else                    writeln("case not null but no 
> length:`", s,  "`");
> }
>
> void main(string[] args)
> {
>     v("hello");
>     v(null);
>     v("");
> }
> ```
>
> The different semantics between `null` and `""` for strings is 
> well illustrated here I'd say.

I promised a litlle sotry, here it is:

https://gitlab.com/basile.b/harbored-mod/-/commit/5ec14dfe98f91384c1b50e7c50fb4767a297d06f

quite the exact same problem, just here the author tested against 
null explictly.